Updated On September 23rd, 2025
Pet's info: Cat | Mixed Breed | Male | neutered | 7 years and 3 months old | 15 lbs
My 7 year old male cat has had a decrease in energy and his third eyelids are showing in both eyes about 95% of the time for the last month or so. He eats and drinks fine, uses the litter box..... I took him to the vet and they said to try waiting it out a few weeks to see if his condition improves as they could find nothing wrong. Is there something else I could/should be doing? The only thing in our lives that has changed in the recent past was the Advantage treatment I started on him. Help!!
1 Answer
Published on April 24th, 2018
If your kitty is an inside outside kitty who tends to also hunt, he could also have tape worm. Sometimes the third eyelid shows when cats are infected with tape worm and/or is infected with a Toro virus causing mild diarrhea as well. This is called Haw's Syndrome and usually goes away with supportive care. If your kitty has access to the outside and catches mice, then there is a chance he ingested a tape worm infected flea. It is not known why tape worm infestation causes the third eyelid to prolapse, however it is suspected that tape worm infection affects the cat's nervous system and therefore the third eyelid prolapses. Ask your vet for some wormer for tape worms (needs to contain praziquantel).
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